All the characters there have been identified... except for the barely visible chick to the upper left.

At long last, we seem to have details on the mystery girl via Weekly Shounen Jump. Someone who claims to have gotten this week's issue in advance says that the character is identified in the magazine as Shian Rem (in Japanese, シアン＝レム -- it could actually be "Cyan"). Voiced by Megumi Hayashibara, Shian is said to be very close to main male character Jude.

The magazine also appears to have details on the game's cooking system, another staple of the Tales series.